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| 1 | <?php |
| 2 | declare(strict_types=1); |
| 3 | /** |
| 4 | * Pop PHP Framework (https://www.popphp.org/) |
| 5 | * |
| 6 | * @link https://github.com/popphp/popphp-framework |
| 7 | * @author Nick Sagona, III <nick@popphp.org> |
| 8 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 9 | * @license https://www.popphp.org/license New BSD License |
| 10 | */ |
| 11 | |
| 12 | /** |
| 13 | * @namespace |
| 14 | */ |
| 15 | namespace Pop\Cache\Adapter; |
| 16 | |
| 17 | use Pop\Cache\Clock; |
| 18 | |
| 19 | /** |
| 20 | * APC cache adapter class |
| 21 | * |
| 22 | * @category Pop |
| 23 | * @package Pop\Cache |
| 24 | * @author Nick Sagona, III <nick@popphp.org> |
| 25 | * @copyright Copyright (c) 2009-2026 Nick Sagona, III |
| 26 | * @license https://www.popphp.org/license New BSD License |
| 27 | * @version 5.0.0 |
| 28 | */ |
| 29 | class Apc extends AbstractAdapter |
| 30 | { |
| 31 | |
| 32 | /** |
| 33 | * Traits |
| 34 | */ |
| 35 | use NamespacedVersionedKeys; |
| 36 | |
| 37 | /** |
| 38 | * Cache namespace |
| 39 | * @var string |
| 40 | */ |
| 41 | protected string $namespace = 'pop_cache'; |
| 42 | |
| 43 | /** |
| 44 | * Constructor |
| 45 | * |
| 46 | * Instantiate the APC cache object |
| 47 | * |
| 48 | * @param int $ttl |
| 49 | * @param string $namespace |
| 50 | * @param Clock\ClockInterface $clock |
| 51 | * @throws Exception |
| 52 | */ |
| 53 | public function __construct( |
| 54 | int $ttl = 0, string $namespace = 'pop_cache', Clock\ClockInterface $clock = new Clock\SystemClock() |
| 55 | ) |
| 56 | { |
| 57 | parent::__construct($ttl, $clock); |
| 58 | if (!function_exists('apcu_cache_info')) { |
| 59 | throw new Exception('Error: APCu is not available.'); |
| 60 | } |
| 61 | $this->namespace = $namespace; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Method to get the current APC info. |
| 66 | * |
| 67 | * @return array |
| 68 | */ |
| 69 | public function getInfo(): array |
| 70 | { |
| 71 | return apcu_cache_info(); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * Get the time-to-live for an item in cache |
| 76 | * |
| 77 | * @param string $id |
| 78 | * @param int $default |
| 79 | * @return int |
| 80 | */ |
| 81 | public function getItemTtl(string $id, int $default = 0): int |
| 82 | { |
| 83 | $cacheValue = apcu_fetch($this->key($id)); |
| 84 | $ttl = $default; |
| 85 | |
| 86 | if (is_array($cacheValue) && array_key_exists('ttl', $cacheValue)) { |
| 87 | $ttl = $cacheValue['ttl']; |
| 88 | } |
| 89 | |
| 90 | return $ttl; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Save an item to cache |
| 95 | * |
| 96 | * @param string $id |
| 97 | * @param mixed $value |
| 98 | * @param ?int $ttl |
| 99 | * @return Apc |
| 100 | */ |
| 101 | public function saveItem(string $id, mixed $value, ?int $ttl = null): Apc |
| 102 | { |
| 103 | $cacheValue = [ |
| 104 | 'start' => $this->clock->now(), |
| 105 | 'ttl' => ($ttl !== null) ? $ttl : $this->ttl, |
| 106 | 'value' => $value |
| 107 | ]; |
| 108 | |
| 109 | apcu_store($this->key($id), $cacheValue, $cacheValue['ttl']); |
| 110 | |
| 111 | return $this; |
| 112 | } |
| 113 | |
| 114 | /** |
| 115 | * Get an item from cache |
| 116 | * |
| 117 | * @param string $id |
| 118 | * @param mixed $default |
| 119 | * @return mixed |
| 120 | */ |
| 121 | public function getItem(string $id, mixed $default = false): mixed |
| 122 | { |
| 123 | $cacheValue = apcu_fetch($this->key($id)); |
| 124 | $value = $default; |
| 125 | |
| 126 | if (is_array($cacheValue) && array_key_exists('start', $cacheValue) && |
| 127 | array_key_exists('ttl', $cacheValue) && array_key_exists('value', $cacheValue)) { |
| 128 | if ($this->isFresh($cacheValue)) { |
| 129 | $value = $cacheValue['value']; |
| 130 | } else { |
| 131 | $this->deleteItem($id); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | return $value; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * Determine if the item exist in cache |
| 140 | * |
| 141 | * @param string $id |
| 142 | * @return bool |
| 143 | */ |
| 144 | public function hasItem(string $id): bool |
| 145 | { |
| 146 | return ($this->getItem($id) !== false); |
| 147 | } |
| 148 | |
| 149 | /** |
| 150 | * Delete a value in cache |
| 151 | * |
| 152 | * @param string $id |
| 153 | * @return Apc |
| 154 | */ |
| 155 | public function deleteItem(string $id): Apc |
| 156 | { |
| 157 | apcu_delete($this->key($id)); |
| 158 | return $this; |
| 159 | } |
| 160 | |
| 161 | /** |
| 162 | * Clear all stored values from cache |
| 163 | * |
| 164 | * @return Apc |
| 165 | */ |
| 166 | public function clear(): Apc |
| 167 | { |
| 168 | apcu_store($this->versionKey(), $this->resolveVersion() + 1, 0); |
| 169 | return $this; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * Destroy cache resource |
| 174 | * |
| 175 | * @return Apc |
| 176 | */ |
| 177 | public function destroy(): Apc |
| 178 | { |
| 179 | $this->clear(); |
| 180 | return $this; |
| 181 | } |
| 182 | |
| 183 | /** |
| 184 | * Atomically increment a counter in cache, creating it at $initial if it doesn't exist |
| 185 | * |
| 186 | * Stored as a raw scalar via apcu_add()/apcu_inc(), bypassing the start/ttl/value envelope used by |
| 187 | * saveItem()/getItem() entirely — a counter key and a saveItem()-managed key are two incompatible |
| 188 | * storage formats on this adapter, and a counter is not readable via getItem(). apcu_inc() has no |
| 189 | * initial-value parameter of its own, so apcu_add() atomically seeds the key at $initial (only the |
| 190 | * caller that finds the key missing succeeds) before apcu_inc() unconditionally applies $amount — this |
| 191 | * two-call sequence stays race-free under concurrency. $ttl is honored only when the counter is first |
| 192 | * created by apcu_add(); a later call does not refresh an existing counter's expiry. |
| 193 | * |
| 194 | * @param string $id |
| 195 | * @param int $amount |
| 196 | * @param int $initial |
| 197 | * @param ?int $ttl |
| 198 | * @throws Exception |
| 199 | * @return int |
| 200 | */ |
| 201 | public function incrementItem(string $id, int $amount = 1, int $initial = 0, ?int $ttl = null): int |
| 202 | { |
| 203 | $key = $this->key($id); |
| 204 | $ttl = ($ttl !== null) ? $ttl : $this->ttl; |
| 205 | |
| 206 | apcu_add($key, $initial, $ttl); |
| 207 | |
| 208 | $success = null; |
| 209 | $result = apcu_inc($key, $amount, $success, $ttl); |
| 210 | |
| 211 | if ($success === false) { |
| 212 | throw new Exception('Error: The value at that key is not numeric.'); |
| 213 | } |
| 214 | |
| 215 | return $result; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Atomically decrement a counter in cache, creating it at $initial if it doesn't exist |
| 220 | * |
| 221 | * Stored as a raw scalar via apcu_add()/apcu_dec(), bypassing the start/ttl/value envelope used by |
| 222 | * saveItem()/getItem() entirely — a counter key and a saveItem()-managed key are two incompatible |
| 223 | * storage formats on this adapter, and a counter is not readable via getItem(). See incrementItem() for |
| 224 | * the apcu_add()+apcu_dec() atomicity rationale. Unlike Memcached::decrement(), APCu allows the result |
| 225 | * to go negative. |
| 226 | * |
| 227 | * @param string $id |
| 228 | * @param int $amount |
| 229 | * @param int $initial |
| 230 | * @param ?int $ttl |
| 231 | * @throws Exception |
| 232 | * @return int |
| 233 | */ |
| 234 | public function decrementItem(string $id, int $amount = 1, int $initial = 0, ?int $ttl = null): int |
| 235 | { |
| 236 | $key = $this->key($id); |
| 237 | $ttl = ($ttl !== null) ? $ttl : $this->ttl; |
| 238 | |
| 239 | apcu_add($key, $initial, $ttl); |
| 240 | |
| 241 | $success = null; |
| 242 | $result = apcu_dec($key, $amount, $success, $ttl); |
| 243 | |
| 244 | if ($success === false) { |
| 245 | throw new Exception('Error: The value at that key is not numeric.'); |
| 246 | } |
| 247 | |
| 248 | return $result; |
| 249 | } |
| 250 | |
| 251 | /** |
| 252 | * Fetch the raw version value from APCu, or false if it isn't set |
| 253 | * |
| 254 | * @param string $key |
| 255 | * @return mixed |
| 256 | */ |
| 257 | protected function fetchVersion(string $key): mixed |
| 258 | { |
| 259 | return apcu_fetch($key); |
| 260 | } |
| 261 | |
| 262 | } |